Color–color diagram containing observational reference data for comparison with the models, adopted from different sources: Galactic Bulge Miras (Groenewegen & Blommaert 2005, grey squares), field M-type LPVs (Mendoza 1967, red diamonds), and C-rich giants (Bergeat et al. 2001, green triangles). Over-plotted are the locations of simulated blackbody emitters in the range of T⋆ = 1100−2000 K (dashed line), as well as an evolutionary track of a star of solar mass and metallicity, using hydrostatic COMARCS model atmospheres (black circles). The colors of a pulsating atmosphere without wind, with stellar parameters L⋆ = 5000 L⊙, T⋆ = 2800 K and M = 1 M⊙, are plotted in blue and the static initial model in orange (diamond).
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